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Characteristics for grade     30   ( 30 )

      Grade :     30   ( 30 )
      Substitute:   25, 35
      Classification :   High quality structural carbon steel
      Equivalent grades:   Go here



Chemical composition in % for grade   30   ( 30 )
C Si Mn Ni S P Cr Cu As
0.27 - 0.350.17 - 0.370.5 - 0.8max   0.3max   0.04max   0.035max   0.25max   0.3max   0.08


Temperature of critical points for grade   30   ( 30 ).
Ac1 = 730 ,      Ac3(Acm) = 820 ,       Ar3(Arcm) = 796 ,       Ar1 = 680 ,       Mn = 380


Mechanical properties under Т=20oС for grade   30   ( 30 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Sheet heat-treatment, GOST 4041-71 4 - 14   430-590  24    
Rolled stock, GOST 1050-88 to 80   490 295 21 50 Normalizing
Rolled stock cold-worked , GOST 1050-88     560   7 35  
Rolled stock annealed , GOST 1050-88     440   17 45  
Band annealed , GOST 2284-79     390-640  16    
Band cold-worked , GOST 2284-79     640-930       


    Brinell hardness for     30   ( 30 )   ,     Sheet GOST 4041-71 HB 10 -1 = 149   MPa
    Brinell hardness for     30   ( 30 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 229   MPa
    Brinell hardness for     30   ( 30 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 179   MPa
    Brinell hardness for     30   ( 30 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 179   MPa


Technological properties for grade   30   ( 30 )
  Weldability: limited weldability.
 Flakes : not predisposed
Temper brittleness: not predisposed


Physical properties for grade   30   ( 30 )
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(m·Grade) kg/m3 J/(kg·Grade) Ohm·m
20 2   52 7850    
100 1.96 12.1 51   470  
200 1.91 12.9 49   483  
300 1.85 13.6 46   546  
400   14.2 43   563  
500   14.7 39   764  
600 1.64 15 36      
700   15.2 32      
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     30   ( 30 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyChinaBulgariaPolandRomaniaCzechia
-DIN,WNrJIS AFNORBSEN UNIGBBDSPNSTASCSN
1030
G10300
M1031
1.0528
C30
C30E
Ck30
S28C
S30C
S33C
SWRCH30K
SWRCH33K
C30E
FR32
XC32
080M32
1.0528
1.1178
C30
C30E
C30
C30E
C30R
30
ML25Mn
ML30
30
30
30A
30rs
OLC30
12031


Specification :
Mechanical properties :
sв - Tensile strength , [MPa]
sT - Yield stress, [MPa]
d5 - Specific elongation at fracture , [ % ]
y - Reduction of area , [ % ]
KCU - Impact strength , [ kJ / m2]
HB - Brinell hardness , [MPa]

Physical properties :
T - Test temperature , [Grade]
E - Young modulus , [MPa]
a - Coefficient of linear expansion (range 20o - T ) , [1/Grade]
l - Termal (heat) condition coefficient , [Watt/(m·Grade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kg·Grade)]
R - Electrical resistance , [Ohm·m]

Weldability :
without limitations - welding is done without heating and subsequent heat treeting
limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing

  30   ( 30 ) - High quality structural carbon steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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